MAX2745 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX2745 Datasheet PDF : 9 Pages
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Single-Chip Global Positioning System
Receiver Front-End
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2745 EV kit, VDD = +2.4V to +3.6V, SHDN = GND, TA = -40°C to +85°C. Typical values are at VDD = +3.0V and TA = +25°C,
unless otherwise noted.)
PARAMETER
SYNTHESIZER
Crystal Input Frequency
Charge-Pump Current
Phase Noise
Maximum PLL Spur
VCO Tuning Frequency Range
VCO Tuning Gain
IF STAGE
IF Stage Gain
Dynamic Range IF Stage Gain
Bandpass Filter 1dB Corner
Frequency
Bandpass Filter 3dB Bandwidth
Bandpass Filter 60dB High-Side
Rejection
Bandpass Filter 60dB Low-Side
Rejection
Image Rejection
In-Band Ripple
AGC Loop Lock Time
CONDITIONS
Fundamental frequency crystal
3rd overtone crystal
fOFFSET = 10kHz offset,
BWLOOP = 70kHz
fOFFSET = 1MHz offset,
BWLOOP = 70kHz
BWLOOP = 70kHz
(Notes 2, 3)
(Notes 2, 3)
VGA set at maximum gain
Low-frequency corner
High-frequency corner
MIN TYP MAX UNITS
16.368
32.736
0.4
MHz
mA
-81
-104
dBc/Hz
-39
150 210
150 210
dBc
270
MHz
310 MHz/V
80
dB
56
dB
3.1
MHz
5.1
2.0
MHz
6.6
MHz
1.6
MHz
17
dB
1
dB
1
ms
Note 1: At TA = +25°C, min/max limits are guaranteed by production test.
Note 2: At TA = -40°C, min/max limits are guaranteed by design and characterization.
Note 3: At TA = +25°C and +85°C, min/max limits are guaranteed by production test.
Typical Operating Characteristics
(MAX2745 EV kit, VDD = +3.0V, SHDN = GND, fRF = 1575.42MHz, and TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
30
26
22
VCC = 3V
VCC = 2.7V
18
VCC = 2.4V
14
10
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
LNA/MIXER GAIN vs. TEMPERATURE
40
35
30
VCC = 3V
25
20
15
10
VCC = 2.4V
VCC = 2.7V
5
0
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
IF STAGE GAIN vs. TEMPERATURE
100
95
90
VCC = 2.4V
85
80
75
VCC = 3V
70
VCC = 2.7V
65
60
-40 -20 0
20 40 60 80
TEMPERATURE (°C)
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